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A012028 sec(sin(arctan(x)))=1+1/2!*x^2-7/4!*x^4+121/6!*x^6-3823/8!*x^8... 0
1, 1, -7, 121, -3823, 186961, -12464695, 967217161, -51115216735, -15922673810399, 12685061907297305, -7463929930799687399, 4531120544938557395633, -3032728078954072676445839 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

CROSSREFS

Sequence in context: A197041 A095752 A113267 * A094088 A012043 A012103

Adjacent sequences:  A012025 A012026 A012027 * A012029 A012030 A012031

KEYWORD

sign

AUTHOR

Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)

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Last modified February 17 14:50 EST 2012. Contains 206050 sequences.